Every time your thermostat calls for heat, the furnace runs a fixed checklist. The inducer motor starts and proves draft by closing a pressure switch, the hot surface igniter heats up, the gas valve opens, the burners light, and the flame sensor confirms there is fire. Only after all of that does the blower start pushing warm air into the house. Finding the step that fails is most of the job. Around Dearborn Heights, MI, the usual failure points are an oxide-coated flame sensor, an igniter cracked by years of heating and cooling, a pressure switch that stays open because of a weak inducer or a clogged condensate trap on a high-efficiency unit, and control boards with burned relays. Each one halts the startup, and from the hallway they all look alike.
For air conditioning breakdowns, see AC Repair.
Signs You Need Furnace Repair in Dearborn Heights
The sooner you notice these red flags, the easier and cheaper the fix. Here are the most common indicators that it's time to call a professional:
- A fan that keeps running while the registers blow cool air
- A bang or boom when the burners ignite late
- Repeated shutdowns just seconds after the burners light
- The igniter glows and clicks, yet no flame ever appears
- Squealing or grinding from the blower compartment
- A furnace that shuts off every few minutes before the house warms up
- Soot, rust, or moisture near the furnace cabinet or vent pipe
- Yellow, wavering burner flames where they should be sharp blue
Don't Wait for a Total Failure
A failing capacitor, clogged condensate drain, or dirty flame sensor rarely fixes itself and usually gets more expensive to address the longer it runs. If you notice any of these signs, call (313) 251-4079 for a prompt inspection.
